Automatic fuel cut-off for oil-burners.



W. R. RAY.

Amon/[Anc FUEL CUT-OFF FOR 0|L BURNERS.

APPLICATION FILED MAY 8, I9I6.

Patented Nov. 20 1917. `j

WITNESSES:

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WILLIAM R. .RAY, OFSAN FRANCISCO, CALIFORNIA.

AToMA'rrc FUEL CUT-OFF Fon OIL-BURNERS.

Specification of Letters Patent.'

Patented Nov. 2o, 1917.

.appuation med May s, 191e.I serial No. 96,109.'

l To all 'whom t may concern.'

Be it known. that I" WILLIAM RAY, a citizen of the United tates, residing at the Francisco and State y city and county of San of California, have invented new and useful Improvements in Automatic Fuel Cut-Offs for Oil-Burners, specification.

This invention relates to automatic fuel of which the following is a cut-oli'I for oil burners. The present invention illustrates an oil burner of the rotary-type described in my pending application, Serial N o. .874754, iiled November 30, 1914, entitled Oil burners.

This burner consists of a casing supporting an electric motor, a direct connected air fan and a centrifugal atomizingv cup to which fuel oil is delivered from any suitable source such as a pump or a gravity supply.

It sometimes happens that an accident to the motor or a temporarily closing down of the main power line renders the motor with connected fan .and atomizer, inoperable. Under such circumstances, seen that means must be provided for automatically cutting olf the fuel supply to the atomizer as it would only be a matter of time when theoil delivered would flood the furnace and either cause an explosion or overiow into the surrounding quarters where a fire might possibly be started.

i The object of the present invention is to` overcome this danger by providing a mechanism which will automatically cut off the fuel supply to the atomizer the moment the fan' slows down below a ycertain number of revolutions per minute or stopsentirely.

Further objects will hereinafter appear. The 'invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings in whichf- Figure l is a side elevation of the oil burner partly in section, showing the application of the invention.

Fig. 2 is a vertical centralsection of the diaphragm. v

Referring to the drawings -in detail, A indicates'an ordinary furnace front and 2 a casing secured thereto in any suitable manner, which forms a support for an electric motor 3, an air fan 4 and a centrifugall atomvided with a hollow shaft 6, one end of revolved 'by the motor,

,is employed for a double purpose.

'bustion within the furnace.

it can readily be Jcasing l cutting off the v it would only be a. matter of time before the 'oil would lflood the furnace or overflow into lzer 5.- The motor is in this instance pro-- which is sufficiently extended to form a support for the fan 4 andthe atomizer 5. The casing 2 not only motor 3 but also serves as a housing for the fan. Formed on the inner side of the housin g is a nozzle 7 which surrounds the atomizlng cup 5. Air entering the fan, when first passes'through the housing 2 and then through an annular air passage 8, formed between the nozzle 7 and the `atomizer 5. f The air thus admitted Yoil-'to the atomizer 5 is made for the purpose of permitting aswinginp;` movement of the It however, forms no part of the present invention. By referring to Fig. 1, itwill'be seen that the furnace front is provided Iwith a plate 14, to which the casing2 is secured by means of the hinges 15. It is thus possible to swing the casing 2 .with the attached motor, fan and nozzle to and from the furnections.

The foregoing description shows that the oil supplied to the atomizer 5 is independent ofthe motor with connected fan and atomizer and that slowing down of the' motor or stoppage ofsame caused-by accident to the power line or otherwise, would not affect theI fuel supply. In other words, it would be possible for the motor with connected fan and atomizer to stop, without affecting the flow of oil to theatomizer. Under suchcirforms a support for the.

First to 2 with relation to the vfurnace front.l

'90 nace frontwithout disturbing .the pipe concumstances, it can readily be seen .that

means must be provided for automatically fuel supply to the burner as the surrounding quarters. This is accomplished in the present instance byV the following mechanism.

Suitably secured at any convenient point with relation to the lfurnace and the burner l '.ploragm 18, ",fver, is a rod n `slotted as at 22, to straddle a lockingv lever as a whole, is a diaphragm valve which is generally `indicated at B. This valve consists ofv a casing 16 provided with acover 17 between which and the casing 16 is mounted a diaphragm 18. Casing 16 is 4sufficiently large to permit the formation of an interior ressure chamber 19.l This chamber is connected with the fan casing2 by means of a pipe 20. Secured to one side of the diaand extending through the 21, the outer end of which is 23 pivotally mounted-as at 24 to the lower end ofthe cover 17. The upper end of this lever is connected to the casing 16 by means of-a coil spring 25, the function of which will later be described. The lower end of the lever 23 isA notched as at 2G to form a seat for a pin 27 secured on a weighted lever 28'connected with a cut-0E valve 29 interposed between the pipe 9 andthe hollow v vber 19 is connected with the casing by means rtating of a pipe 20. Pressure thus admitted causes the diaphragm 18 to` eXpand lor assume the .full line position shown in Fig. 2. 'The rod extension 21l carried by the diaphragm will then-force the lever 23 away from the cover and cause it to assume the 4fullline position shown in Figs. 1 and 2. The weighted lever controlling the position -of the valve 29 may now be raised until the pin 27 is engaged by the notch 26 formed in the lower end of the lever. This position'o-f the valve 29 is open to permit the fuel oil to pass through the pipe line and the connections herebefore described to a point' where its flow is regulated by valve 12 -before it is finally admitted to the atomizer 5. The diaphragm will re-.. main in the expanded position shown as long y as the motor, with connected fan, is vrobove a certain'number of revolutions per minute but the tension ofthe spring 25 connected with the upper end of the lever 23 is sufficient to overcome the air pressure in the chamber 19 themoment the motor, with connected fan, slows down below a certain number of revolutions per minute or stops. rThe lever will thus be retracted to resume the dotted line position indicated at 23, see Fig. 2. The pin 2G will l vthus be released' and the weighted lever will be permitted to drop and assume the dotted line position shown at 28, thus closing the valve 29 and cutting ou the fuel supply to `of engagement This will .immedi-L is, as previously i ,aen-leo the atomizer the momentthe motor, with 'connected fan, stops or slows down below a certain number of revolutions per minute. When the -lever23 and the weighted lever 23 are in engagement, the weight of the lever 28 is applied to the lever 23 in conjunction with the spring 25 to force the diaphragm 13 inwardly against the air pressure against the diaphragm. The tendency of the weighted lever is to swing down out with the lever 23, so that soon as the pressure in the valve B drops below normal, the weight ofthe lever 23 alone is s iuiieient to cause the `pin 27 to escape the notch 26, so that the lever will drop and close., the valve 29. lt will thusbe seen that the spring 25 and the weight, of the lever 28 both 'serve to disengage the pin 27 from the notch 26 to enable the lever 23 to closethe valve 29 when'the pressure in the valve B drops below normal, thus doubly insuring certain and positive operation of the device. Any danger of' explosion within the furnace caused by an over-supply of oil o r flooding or ever-flowing into surrounding quarters is thus obviated as the fuel supply is automatically cut off. The pipe '20 forming a connection between vthe housing 2 and the .pneumatic valve chamber 19 is connected with a hollow pintle 30 which in turn is connected through a pipe 31 with the interior' of the fan housing. This peculiar arrangement 'of described,I provided Vfor the purpose of permitting the casing with attached motor fan and atomizer, "to swing about the hinges 15 without breaking or disturbing either the air or oil pipe connections. The diaphragm valve as a whole is simple in construction and easy to'attach. While` it is here shownas arranged directly above the burner, it is obvious (that it may be placed at any convenient point within the furnace room without materially changing the conl nections here' shown.

,'Thevmaterials and finish of the several parts of the. invention may be such as the judgment and lexperience of the manufacturer may dictate. i

l4 wish it understood that various changes in form,l proportions and minor details of construction may be resorted to within the scope not wish to limit myself to the specific design and construction here shown.

Having thus described my invention, l claim and desire to secure by Letters Patent is l 1. ln combination, oil-supply means and air-supply means,'a cut-off valve for controlling said oil-supply means, a diaphragm adapted to be actuated by the air pressure of said air-supply means, a pivotedlocking lever actuated by said diaphragm and formed with a seat, and a weighted operatwhat.

the pipe connections l of the appended claims and that l do seat of the locking lever to hold said Weighted lever releasably.

2. In combination, oil-supply means and air supply means, a cut-olf valve for controlling said oil-supply, a casing connected with the air supply means, pressure-operated means in the casing including a slidable stem having its outer end slotted, a locking lever pivoted between its ends to one side of the casing and engaged in the slotted end of the stem, a spring connecting one end of the lever to the opposite side of the casing, and means releasably engaging the opposite end of the lever for operating the valve. l

3. In combination, oil-supply means and air supply means, a cut-off valve for controlling ,said oil-supply, a casing connected With the air supply means, pressure-operated means in the casing, a locking lever pivoted to the casing and formed With a notch in one edge, said lever being operable by the pressure-operated means, a lever for operating the valve mounted for swinging alongside of -ver to the casing the locking lever in a, plane substantially parallel with the plane of movement of said locking lever, and a laterally extend-ing pin carried by the valve lever for engaging detachably in the notch of the locking lever.

A4. In combination, oil-supply means and air supply means, a cut-off valve for controlling said oil-supply, a casing connected With the air supply means, pressure-operated means in the casing, including a stem having its outer end formed vwith a seat, a lever pivoted on the casing and freely engaging in the stem seat, a

and tending to hold the lever in its seat, and means for controlling spring connecting the lethe valve releasably locked open by said 4 locking lever. l

'In testimony whereof l have hereunto set my hand in the presence lof two subscribing Witnesses. i

WILLIAM R. RAY. 

